Alert archive / Colorado / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 27, NWS Grand Junction, CO

September 17, 2001Garfield County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Sep 17, 2001, 1:58 PM MDT for Garfield County, Colorado. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 17, 2001, 1:58 PM MDT (19:58 UTC)
Expired: Sep 17, 2001, 2:45 PM MDT
In force: 47 min
Issued by: NWS Grand Junction, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Garfield County, CO

The radar

The Grand Junction radar (KGJX), 65 km from the middle of the area, began a volume at 20:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 17, 3:29 AM MDT, 10 hours 29 minutes earlier.

Area forecast discussion, Sep 17, 3:29 AM MDT, 10 hours 29 minutes before

WESTERN COLORADO & EASTERN UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
329 AM MDT MON SEP 17 2001

ACTIVE WEATHER DAY IN STORE FOR EASTERN UTAH AND WESTERN COLORADO.
KGJX WSR-88D ALREADY QUITE ACTIVE WITH SCATTERED TO NUMEROUS
SHOWERS AND THUNDERSTORMS.  ACTIVITY WEAKENS AS IT DROPS INTO THE
VALLEYS...BUT STILL SEEING SOME RAIN.

THIS WILL BE THE TREND FOR THE ENTIRE DAY AS UPPER LEVEL TROUGH/LOW
OVER NRN UT WILL BE MOVING EAST TODAY AND TONIGHT.  ENERGY EJECTING
OUT OF THE TROUGH WILL BE SENT ENE AND WILL BE AIDED BY THE LEFT EXIT
REGION OF H3 JET MAX WHICH BECOMES ORIENTED ALONG UTAH/ARIZONA AND
COLORADO/NEW MEXICO STATE LINES. PRECIPITABLE WATER VALUES FROM
UPSTREAM SOUNDINGS AND FCST MODEL SOUNDINGS NOT THAT IMPRESSIVE.
HOWEVER...RADAR RETURNS THIS MORNING INDICATE SOME MODERATE RAIN IS
LIKELY FALLING OVER THE HIGHER ELEVATIONS...SO WL CONTINUE MENTION OF
LOCALLY HEAVY RAIN FOR THE MOUNTAIN REGIONS TODAY. SMALL HAIL THREAT
ALSO LOOKS LEGIT WITH SIGNIFICANT COOLING ALOFT. SOME SNOW WILL
LIKELY OVER THE HIGHEST PEAKS TODAY...WITH SNOW LEVELS DROPPING TO AS
LOW AS 10K TONIGHT.  NOT EXPECTING WIDESPREAD ACCUMULATIONS AT PASS
LEVELS...ALTHOUGH CONVECTIVELY AIDED SNOW SHOWERS COULD DROP A FEW
INCHES OF WET SNOW. TROUGH AXIS TIMED TO SLIDE THROUGH AROUND
MIDNIGHT TONIGHT...WITH NWLY FLOW SETTING UP FOR TUE.  THIS WL PUT
THE EMPHASIS OF ANY ADDITIONAL PRECIP ON TUE OVER THE NRN MTNS...WITH
ONLY ISOLATED MORNING ACTIVITY ELSEWHERE.

FAIRLY FLAT...ZONAL PATTERN THEN BUILDS OVER THE AREA FROM WEDNESDAY
THROUGH THE END OF THE WEEK.  OVERALL...PATTERN APPEARS TO BE DRY...
BUT WEAK DISTURBANCES IN THE FLOW MAY BRING SOME MOUNTAIN SHOWERS
FROM TIME-TO-TIME.  NOT PLANNING ANY CHANGES TO EXTENDED PERIODS
THOUGH...AS THIS WILL BE TOUGH TO TIME AT THIS POINT...AND WL MAKE
ADJUSTMENTS AS THE WEEK WEARS ON.

WESTERN COLORADO AND EASTERN UTAH EMERGENCY MANAGERS SHOULD MAINTAIN
A HEIGHTENED LEVEL OF WEATHER AWARENESS THROUGH TONIGHT DUE TO
SCATTERED SHOWERS AND THUNDERSTORMS...SOME WHICH WILL PRODUCE
LOCALLY HEAVY RAIN AND SMALL HAIL. IN ADDITION...SNOW LEVELS WILL
LOWER TO AROUND 10K BY TONIGHT WITH THE POSSIBILITY OF SOME
ACCUMULATIONS NEAR CONVECTIVE SHOWERS.

COLTON

.GJT...NONE.

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 17, 1:11 PM MDT	Severe Thunderstorm Warning	GJT	Garfield, Rio Blanco	49 min
Sep 17, 2:59 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	46 min
Sep 17, 3:16 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	44 min
Sep 17, 3:59 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	46 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.